Printing-frame.



I. A ROBERTSON.

PRINTING FRAME.

APPLICATION FILED MAY 24, I9I6.

Patenfed Aug. 21, 1917.

221s ATTORNEYS UNITED STATES PATENT OFFICE.

JOHN A. ROBERTSON, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK COM- PANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

PRINTING-FRAME.

Application filed May 24, 1916.

T 0 all whom it may concern:

Be it known that 1, JOHN A. ROBERTSON, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Printing- Frames; and I do hereby declare the following to be a full, clear, and exact descrip tion of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

My present invention relates raphy and more particularly to photographic printing frames and it has for its object to provide a simple, cheap and con venient frame in which special provision will be made for insuring the fixed relationship of the negative and the printing paper once they are assembled in superposition while at the same time permitting a portion of the printing paper to be pulled away from the negative from time to time in inspecting the progress of the printing. The invention contemplates the embodiment of this improvement in a printing frame of the form hitherto in use without any substantial modification in the form of the frame proper. To these and other ends the invention resides in certain improvements and combinations of parts all as will be hereinafter more fully described the novel features being pointed out in the claim at the end of the specification.

In the drawings:

Figure 1 is a perspective view of the rear side of the printing frame constructed in accordance with and illustrating one embodiment of my invention, the parts being in working positions;

Fig. 2 is a longitudinal section therethrough, and

Fig. 3 is a perspective view of one of the locking brackets for the back, detached.

Similar reference numerals throughout the several views indicate the same parts.

Referring more particularly to the drawings, 1 indicates the side rails and 2 the end rails of a body or frame of the usual form having a rabbet or ledge formed forwardly within its opening to seat a glass front 4:. The negative is placed against the glass and the sheet of printing-out paper in rear of it, as usual, and the two are held in intimate contact by the pressure of a. platen or back that is removable from the frame to photog- Specification of Letters Patent.

Patented Aug. 21, 1917.

Serial No. 99,687.

and composed of two sections 5 and 6,

These sections are hinged together at 7 so i shown in the figures and their pressure against the paper is a spring pressure contributed by individual double spring arms 8, one of which is pivoted at 9 at its center to each section so that the ends may be flexed and rotated into engagement with ledges 10 on the side rails 1.

In the practice of the present invention, one of the end rails 2 of the frame is provided with two fixed centering and locking pins 11 projecting real-wardly therefrom at points removed from the margins of the opening of the frame. These pins do not, however, project beyond the relatively thicker side rails 1 which protect a support ing surface from contacting with the pin when the frame is laid down front uppermost. In the present instance, one of the sections 5 is narrower than the other and this section is provided at each end with a metal strap or bracket leaf 12 that is riveted against the face of the section by a fastener 13 extending through an aperture 1 1 and by prongs or spurs 15 formed downwardly on the end of the metal strip so that they can be driven into the material of the section, usually of wood. The projecting portion of the back is offset at 16 to rest upon the rear face of one of the end rails 2 of the frame when the back is within the latter and this projecting portion is, in each instance, apertured at 17 to receive one of the pins 11. The pins, fitting these apertures tightly, thus lock the section 5 and hence the whole back against movement in all directions parallel with the glass l and with the paper and negative or in all directions except av rearward direction in which the back is drawn out of the frame when detached or removed, in which case the brackets are pulled off'of the pins.

With such a construction, when it is desired to inspect the progress of the printing or to separate the negative and paper for any purpose necessitating partially relieving the clamping action against these articles, the spring arms 8 of the section 6 of the back are rotated out of engagement with the ledges 10 and this section raised on the hinge 7 exposing the paper. If the spring arms on the other section were at this time alone relied upon to hold the remainder of the back and hence the sheets beneath in position, it would be inadequate for the reason that the arms 8, held against the ledges 10 only by spring pressure, are apt to slip thereon and permit endwise movement of the section and hence relative displacement of the negative and paper, it being impracticable to make the back fit the opening in the frame so snug-1y even as to prevent movement toward and from the adacent rails of the frame. Vith the cooperating locking devices 11 and 12, however, between the section 5 and a rail of the frame, all such movements are reliably provided against, it being both practical and easy to fit the pins 11 closely to the apertures 17. It is nevertheless obvious that the back may be removed from the frame as easily as before, the pins offering no obstruction and requiring no extra motion for their disengagement.

I claim as my invention:

In a photographic printing frame, the combination with a frame piece having a glass at the front and a two-piece removable back lying within the frame piece and comprising two relatively movable sections hinged together and having independent fastening devices, of cooperating locking members on one of the back sections and a rail of the frame, respectively, comprising two rearwardly projecting centerin pins arranged on the rear of one of sai I parts and rigid apertured brackets fixed on the other, said pins being arranged to fit closely the apertures in the bracket to prevent movement of the back section in all but a rearward direction.

JOHN A. ROBERTSON.

Witnesses:

EDITH WATERSTRAAT, M. JOSEPH SULLIVAN.

copies of this patent may be obtained for five cents each, by addressing the Glmmiutoner 0! PM! Washington, D. 0." 

